Thermostatically-controlled mixing device



Aug 13, 1929. A. MURDOCH, JR 1,724,504

THERMOSTATICALLY CONTROLLED MIXING DEVICE Filed Deo. 30, 1927 2 Sheets-Sheet l ug- 13, 1929 A. MuRDocl-l, JR 1,724,504

THERMOSTATICALLY CONTROL-LED MIXING DEVICE Filed Deo. 30, 1927 2 Sheets-Sheet 2 Patented Aug. i3, 1329.

NTTED STATES ALEXANDER MURDOCH, JB., OF PHILADELPHIA, PENNSYLVANIA.

THIEBMQSTATICALLY-CONTROLLED MIXIN DEVICE.

Application led :December 30, 1927. Serial No. 243,634.

The principal object of the present invention is to provide a device of the character mentioned which shall be comparatively simple in construction, accurate and reliable in operation, and capable of ready adjustment.

Other objects of the invention will appear from the following description at the end of 'which the invention will be claimed.

The invention will be first described in connection with the accompanying drawing forming part hereof and in which Figure 1 is a view, principally in central section and with parts removed, of a mixing device illustrating one embodiment of the invention selected from other embodiments.

Fig. 2 is a transverse central section of the same.

Fig. 3 is a top or plan view of the interior portion of the device' shown in Fig. 1.

Fig. 4 is a section taken on the line l 1 -4i of rig. 1.

Fig. 5 is a sectional view taken on the line 5-5 of Fig. 2.

Fig. 6 is a sectional view taken on the line 6 6 of Fig. 5.

Fig. 7 is a section taken on the line 7-7 in Fig. 8 and it illustrates a modification:

Fig. 8 is front elevation of a modlficatlon, and

Fig. 9 is a section on the line 9-9 of Fi 8.

Igteferring to the drawing and more particularly to Figs. 1 to 6, l is a tubular T fitting. 2 is a housing interposed between the arms of the T tting and providedwith spaced valve chambers 3 closed at one end and connected with the interior of the arms. The housing is ported as at 13 and 14: to the interior of the stem of the T tting. indicates perforated valves arranged 1n the chambers and having a stem 6 by which they are connected and which traverses the space 4 between the chambers. 7 is a thermostatic element mounted as at 8 in the stem of the T tting and its free end is connected with the valve stem 6. There are means for setting or adjusting the thermostatio element 7 and they are shown to comprise a turnable spud 9 having a fork with V-shaped space between its prongs in which the thermostatic element 7 is arranged. The Spud also carries the internal toothed rack element 10. This rack element is engaged by a pinion 11 carl'ied by a turnable hand piece or knob 12.

In desf.ribing the mode of operation it will 'be assumed that the arms of the T litting,

be done without interfering with the freedom of the thermostatic element lfor subsequent action. When the valve c is open, if the mixture ofhot and cold water passing through the arm of the T fitting is not at the desired temperature, for example, if it is too hot, the thermostat shifts the valve 5, shown at the right hand in Fig. 1, toward the left, covering the port 13 and so restricting the supply of hot water passing from by way of 13 and 14. If the mixture is too cold, the thermostat operates in the opposite direction covering the port 14 and so reducing the supply of cold water. Inasmuch as the valves 5 are balanced by reason of the perforations and chambers 3, the thermostat is required to do very little work and therefore accurately shifts and positions the valves to produce a mixture of hot and cold water at substantially the temperature required. When the valve c is closed the thermostatic element operates to limit the `temperature of the water in the stem of the T fitting.

The construction and mode of operation of the modication shown in Figs. 7 to 9 are as above described, except as follows and the corresponding parts are indicated by the same numbers with the exponent a.

The housing 2a and the parts carried thereby are arranged crosswise of the head of the fitting and are removable from and insertable into the' tting and for that purpose the cap c, may be removed. The thermostat 7L and its mounting 8a are removable through the end of the stem.

The thermostat is adjusted by the hand screw d. The hot water goes by e and the cold water by f to the fluid way g, in the stem of the litting.

It will be obvious to those skilled in the art to which the invention relates that modifications may be made in details of construction and arrangement and matters of mere form without departing from the spirit of the invention which is not limited to such matters or otherwise than the prior art andv the appended claims may require.

1. A thermostatically controlled mixin device comprising a tubular fitting of shape having diverging arms/and a stem, a housin removably interposed between the arms o the fitting and provided with spaced valve chambers closed at one end and respectively communicating with -the interior of the arms of the fitting and ported to the interior of the fitting, perforated valves arranged in said chambers and having a valve stem by which they are connected and which traverses the space between the chambers, and a thermostatic element removably mounted in the stem of the fitting and having its free endconnected with said valve stem.

2. A ythermostatically controlled mixing device comprising a tubular fitting of T shape having diverging arms and a'stem, a housing inter osed between and crosswise of the arms o the fitting and provided ywith spaced valve chambers closed at one end and respectively communicating with the interior of the arms of the fitting and ported to the interior of the fittinrr, perforated valves arranged in said cham ers and having a valve stem by which they are connected and which traverses the space between thefchambersa thermostatic element removably mounted in the stem of the fitting and having its free end connected with said valve stem, and a turnable hand screw penetrating the wall of the stem and adapted to press upon the thermostat.

ALEX. MURDooK, JR.

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